Gorf is an arcade game released in 1981 by Midway Mfg., whose name was advertised as an acronym for "Galactic Orbiting Robot Force". It is a multiple-mission fixed shooter with five distinct modes of play, essentially making it five games in one. It is well-known for its use of synthesized speech, a new feature at the time. Source: Wikipedia, "Gorf," available under the CC-BY-SA License.